42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import annotations
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from typing import Any, Dict
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def nested_update(this: Dict[Any, Any], that: Dict[Any, Any]) -> Dict[Any, Any]:
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"""Merge two nested dictionaries.
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Effectively a recursive ``dict.update``.
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Examples
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--------
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Merge two flat dictionaries:
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>>> nested_update(
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... {'a': 1, 'b': 2},
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... {'b': 3, 'c': 4}
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... )
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{'a': 1, 'b': 3, 'c': 4}
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Merge two nested dictionaries:
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>>> nested_update(
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... {'x': {'a': 1, 'b': 2}, 'y': 5, 'z': 6},
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... {'x': {'b': 3, 'c': 4}, 'z': 7, '0': 8},
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... )
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{'x': {'a': 1, 'b': 3, 'c': 4}, 'y': 5, 'z': 7, '0': 8}
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"""
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for key, value in this.items():
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if isinstance(value, dict):
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if key in that and isinstance(that[key], dict):
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nested_update(this[key], that[key])
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elif key in that:
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this[key] = that[key]
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for key, value in that.items():
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if key not in this:
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this[key] = value
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return this
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